[16 marks] Alice and Bob are on Earth, and they have synchronised their clocks. At t = 0, Alice takes a spaceship, and l

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[16 marks]
Alice and Bob are on Earth, and they have synchronised their clocks. At t = 0, Alice takes a spaceship, and leaves Earth at a speed of 0.7c. After one year has
passed on the clock of Alice, she sends a light signal back to Earth. Some time later,
the light signal is detected by Bob, who has remained on Earth.
(a)According to Bob, at what time did Alice send out the light signal?
(b) According to Bob, at what distance from Earth is Alice, at the moment
that the light signal is sent out?
(c) What is the time on the clock of Bob, when he receives the signal from
Alice?
(d) According to Alice, what is the time on her clock when the light signal
arrives at Bob?